JPH07300774A - Silicone coating processed substrate and air bag substrate - Google Patents

Abstract

PURPOSE:To obtain a fiber excellent in heat resistance by applying a coating agent containing a specific silicone compound, inorganic powder, etc., to woven fabric or nonwoven fabric made of a polyamide fiber or a polyester fiber and forming extremely thin film on the fabric. CONSTITUTION:A coating agent containing (A) 100 pts.wt. of a polyorganosiloxane having two alkenyl groups directly bonded to Si in one molecule, (B) an organohydrogenpolysiloxane having two hydrogen atoms bonded to Si based on one alkenyl group, (C) 0.1-10 pts.wt. of a silicon compound having one epoxy group and/or a trialkoxysilyl group bonded to Si through one hydrogen bonded to Si and carbon directly bonded to Si in one molecule, (D) 0.1-100 pts.wt. of powder selected from carbon, NiO2, FeO, etc., and having <=20mum particle diameter and (E) a platinum catalyst is applied to all or a part of a substrate selected from woven fabric or nonwoven fabric of a polyamide fiber or a polyester fiber, a thermoplastic elastomer and a polyurethane sheet so as to form a film having 5-20mum thickness to provide the objective air bag substrate excellent in heat resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicone-coated substrate such as an airbag substrate on which a film of a silicone coating agent is formed, and an airbag substrate.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Chloroprene-based resin compounds are used as coating agents for automobile airbags. Further, using this chloroprene-based resin blend, a composite material obtained by impregnating, coating or laminating the resin blend onto a fiber base material of a woven fabric, knitted fabric or non-woven fabric made of polyamide-based fibers is a polyamide-based fiber and chloroprene. It has excellent properties of resin and is used for many purposes.

However, when the chloroprene resin is left for a long time in an atmosphere of a certain temperature or higher, hydrogen chloride liberated from the resin breaks the amide bond constituting the polyamide fiber to lower the strength of the composite material. was there.

Further, since the chloroprene resin is relatively hard, the resin excessively restrains the polyamide fibers in the fiber base material in the composite material, and the free movement of the fibers is alienated.
Therefore, the texture of the composite material becomes hard and the tear strength is small.

In order to solve these drawbacks, it has been proposed to use a coating agent containing a silicone resin as a main component, which is superior in heat resistance, weather resistance and flexibility to chloroprene resins. For example, there is a heat vulcanizing type silicone rubber and an adhesiveness imparting agent, or an addition type silicone rubber and an adhesiveness imparting agent. When a coating film is formed on a substrate such as an automobile airbag using this silicone coating agent, its thickness is generally about 40 μm. However, there is a demand for further weight reduction, compactness, and cost reduction in the market, and there is a demand for reducing the coating thickness.

In this case, the conventional coating agent has a higher burning rate when the thickness of the coating film is reduced,
Also, especially when used for automobile airbags, if the thickness is thin, there will be holes in the airbag due to the explosion of the inflator,
There is a problem that airtightness cannot be maintained, and it is in a situation where it cannot be put to practical use.

The present invention has been made in view of the above circumstances, and has a high flame resistance even when a thin coating film is formed, and a thin coating film having a thickness of 5 to 20 μm, particularly for an automobile airbag. It is an object of the present invention to provide a silicone-coated base material and an air bag base material that can retain the function as an air bag even when used, even when the inflator explodes.

[0008]

The inventor of the present invention has
As a result of earnest study to achieve the above purpose, (A) 1
At least an alkenyl group directly bonded to a silicon atom in the molecule
100 parts by weight of two organopolysiloxanes,
(B) Silicon source for one alkenyl group in component (A)
Give 0.5 to 4 hydrogen atoms (SiH groups) bonded to the child
Hydrogen bonded to silicon atom in one molecule
Organo high having at least two atoms (SiH groups)
Drogene polysiloxane, (C) Silicon atom in one molecule
Directly connect at least one hydrogen atom bonded to
Carbon atoms (eg methylene, ethylene, propylene)
And an alkylene group such as
At least a poxy group and / or a trialkoxysilyl group
0.1 to 10 parts by weight of an organosilicon compound having one
(D) Carbon, NiO₂, FeO, FeO₂, Fe
₂O₃, Fe₃O_Four, CoO₂, CeO₂And TiO₂Select from
One or more powders with an average particle size of 20 μm or less
0.1 to 100 parts by weight, (E) catalytic amount of platinum or platinization
Compound, more preferably (F) benzotriazole and
/ Or benzimidazole 1 part by weight or less, and (G) reinforcement
Silicone coat containing 100 parts by weight or less of hydrophilic silica
As the wing agent, this is a polyamide fiber or polyester fiber.
Fibers, woven and non-woven fabrics of these, thermoplastic elastomers
And apply to a substrate selected from polyurethane sheet,
When a coating film is formed, it is about 40 μm, which is the conventional value.
5 to 20 μm thinner than the coating thickness of the coating film
Even if the film thickness is sufficient for practical use and exhibits good flame resistance,
, Especially for inflators for automobile airbags
We found that the function could be retained even by an explosion, and
It was the invention.

Therefore, according to the present invention, a film of the silicone coating agent containing the components (A) to (E), preferably the components (F) and (G), is formed in a thickness of 5 to 20 μm. A silicone coated substrate is provided. The present invention also provides an airbag base material on which a film of the silicone coating agent is formed.

The present invention will be described in more detail below. The organopolysiloxane as the component (A) of the coating agent of the present invention has at least two alkenyl groups bonded to silicon atoms in one molecule.

This organopolysiloxane has the following average compositional formula R ¹ _n R ² _m SiO _{(4-nm) / 2} (wherein R ¹ is an unsubstituted or substituted monovalent carbon atom excluding an aliphatic unsaturated bond). Hydrogen group, R ² is an alkenyl group, n and m are 0.7 <n <2.2, 0 <m ≦ 0.1 and 0.8 <m, respectively.
It is a positive number that satisfies + n ≦ 2.2. ), Which may be in any of linear, branched, reticulated and three-dimensional resinous material structures, or may be a mixture thereof. Generally, it is usually a straight-chain diorganopolysiloxane in which the main chain portion is basically composed of repeating diorganosiloxane units and the molecular chain ends are blocked with triorganosilyl groups. Further, two or more alkenyl groups contained in the molecule may be bonded to either a silicon atom at the end of the molecular chain or a silicon atom in the middle of the molecular chain, but from the viewpoint of curing rate, physical properties of the cured product, etc. It is preferable that they are bonded to silicon atoms at both ends of the chain.

The alkenyl group bonded to a silicon atom (R ^{2 in the} above average composition formula) is preferably one having 2 to 8 carbon atoms, such as vinyl group, allyl group, 1-propenyl group, isopropenyl group, 1 -Butenyl group, 3-butenyl group, isobutenyl group, hexenyl group and the like can be mentioned, but vinyl group is most preferable from the viewpoint of ease of synthesis and chemical stability. The organic group bonded to a silicon atom other than the alkenyl group (R ^{1 in the} above average composition formula) has 1 to 1 carbon atoms.
An unsubstituted or substituted monovalent hydrocarbon group of 0, which does not particularly have an aliphatic unsaturated bond, is preferable. Specifically, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a hexyl group,
Alkyl group such as octyl group, decyl group, phenyl group, tolyl group, xylyl group, aryl group such as naphthyl group, cycloalkyl group such as cyclohexyl group, benzyl group, aralkyl group such as phenylethyl group, chloromethyl group, bromoethyl group Examples thereof include halogen-substituted and cyano-substituted hydrocarbon groups such as groups, trifluoropropyl groups and cyanoethyl groups. Of these, from the viewpoint of easiness of synthesis and chemical stability, it is preferable that they are all methyl groups or consist of a methyl group and a phenyl group. Further, this organopolysiloxane has a viscosity at 25 ° C. of 100 cSt or more, preferably 100 to 10,000,000 cS.
It is preferably t, particularly 500 to 1,000,000 cSt. If it is less than 100 cSt, the cured product becomes brittle and the coating substrate becomes hard. Also, the viscosity is 1
If it exceeds 0,000,000 cSt, handling may be difficult and workability may be poor, or the amount of the solvent to be diluted may be uneconomical when applied by a method such as coating or screen printing. Incidentally, these siloxanes can be synthesized by a conventionally known method.

Next, the organohydrogenpolysiloxane as the component (B) is subjected to an addition reaction (hydrosilylation reaction) with the alkenyl group in the component (A) in the presence of the component (E) described below to give the present invention. It is an essential component for curing the above coating agent to give a silicone cured product having practically sufficient strength.

This organohydrogenpolysiloxane has the following average compositional formula R ³ _a H _b SiO _{(4-ab) / 2} (wherein R ³ represents an unsubstituted or substituted monovalent hydrocarbon group, and , B are 0.5 <a <2.2 and 0.002, respectively.
It is a positive number that satisfies ≦ b ≦ 1 and 0.8 <a + b ≦ 3. ) Can be used.

The organopolysiloxane must have at least two hydrogen atoms (SiH groups) bonded to a silicon atom, preferably three or more, in one molecule, but the molecular structure is not particularly limited. Various types of conventionally manufactured linear, branched, annular and three-dimensional resinous structures are used. The hydrogen atom bonded to the silicon atom may be bonded to either a silicon atom at the end of the molecular chain or a silicon atom in the middle of the molecular chain.

In the above formula, R ³ is preferably an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, which does not have an aliphatic unsaturated bond. Specifically, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a hexyl group, an octyl group, an alkyl group such as a decyl group, a phenyl group, a tolyl group,
Aryl group such as xylyl group and naphthyl group, cycloalkyl group such as cyclohexyl group, aralkyl group such as benzyl group and phenylethyl group, chloromethyl group, bromoethyl group, trifluoropropyl group, halogen substitution such as cyanoethyl group and cyano substitution A hydrocarbon group can be exemplified. Of these, it is preferable that all of them are methyl groups or that they are composed of a methyl group and a phenyl group, like the component (A). The viscosity at 25 ° C. is 300 cSt or less, preferably 0.1 to 300 cSt, particularly 1 to 200 cSt.
Is preferred. If the viscosity exceeds 300 cSt, the compatibility with the component (A) may deteriorate.

The amount of the component (B) used is such that the amount of hydrogen atoms (SiH groups) bonded to silicon atoms in the component (B) is 0.5 to 4 with respect to one alkenyl group in the component (A). The amount is equivalent, and preferably 1 to 3 equivalent. 0.
When it is less than 5 equivalents, the mechanical strength of the cured product is poor, and when it is 4 equivalents or more, foaming tends to occur during curing.

By blending the organosilicon compound as the component (C) in the present invention, the coating film is provided with adhesiveness to polyamide-based fibers, polyester-based fibers, non-woven fabrics, thermoplastic elastomers or polyurethane sheets. It is an ingredient and an essential ingredient in the present invention. This organosilicon compound has at least one hydrogen atom (SiH group) bonded to a silicon atom in one molecule, preferably two or more, and a carbon atom directly bonded to the silicon atom (for example, a methylene group, an ethylene group, a propylene group). Epoxy group bonded to a silicon atom via an alkylene group such as
Alternatively, any compound may be used as long as it is an organosilicon compound having at least one trialkoxysilyl group, and organosilane, linear, cyclic or branched organo (poly) siloxane is used. In this case, examples of the epoxy group and trialkoxysilyl group bonded to the silicon atom via the carbon atom include the following.

[0019]

[Chemical 1] (In the formula, R ⁴ represents an alkyl group having 1 to ⁴ carbon atoms or an alkoxy-substituted alkyl group, and c is 1, 2, 3 or 4.)

As the above-mentioned organosilicon compound, one having a linear or cyclic polysiloxane skeleton is preferable from the viewpoint of easy synthesis. In the case of a cyclic polysiloxane skeleton, the number of silicon atoms forming the siloxane ring is 3 to 6 for ease of synthesis.
One, preferably four is used. In contrast,
In the case of a linear polysiloxane skeleton, if the molecular weight is large, the viscosity becomes high, which makes the synthesis and handling inconvenient. Therefore, the number of silicon atoms forming the siloxane chain is preferably about 5 to 50.
It is not particularly limited to this. In addition, the hydrogen atom (SiH
Group) and a trialkoxysilyl group or an epoxy group, in the case of having an organic group bonded to a silicon atom, this organic group is the same as that exemplified as R ³ in the above-mentioned component (B), preferably a fat group. Group _{1 to} C excluding unsaturated bonds
It may be ₁₀ unsubstituted or substituted monovalent hydrocarbon groups.

The above-mentioned organosilicon compound is usually an organic compound having an alkenyl group and an epoxy group and / or a trialkoxysilyl group in an organohydrogenpolysiloxane having a hydrogen atom bonded to three or more silicon atoms in one molecule. It is prepared by a partial addition reaction according to the method. After completion of the reaction, a mixture obtained by removing the unreacted material and the catalyst for addition reaction may be used, but it is preferable to isolate the desired product and use it.

Specific examples of the cyclic or linear organopolysiloxane used as the component (C) are as follows.

[0023]

[Chemical 2]

The amount of component (C) used is 100 parts of component (A).
0.1 to 10 parts by weight, preferably 0.
It is in the range of 5 to 5 parts by weight. If the amount is less than 0.1 part by weight, sufficient adhesive force cannot be obtained. If it exceeds 10 parts by weight, the mechanical properties of the cured product deteriorate, and foaming easily occurs during curing.

The component (D) used in the present invention imparts high temperature resistance to the coating substrate.
O ₂ , FeO, FeO ₂ , Fe ₂ O ₃ , Fe ₃ O ₄ , Co
Average particle size 20μ selected from O ₂ , CeO ₂ and TiO ₂
m or less, preferably 0.01 to 20 μm, more preferably 0.02 to 10 μm, still more preferably 0.02 to 1 μm.
1 type or 2 types or more of the powder of m is used. Average particle size is 2
If it exceeds 0 μm, the surface is not smooth when a thin film of 5 to 20 μm is processed, which is not suitable. The average particle size is 0.0
If it is less than 1 μm, the secondary agglomeration is hard to collapse, and a particle having a uniform particle size may not be obtained.

The blending amount of the component (D) is 100 parts of the component (A).
It is preferably 0.1 to 100 parts by weight with respect to parts by weight. If it is less than 0.1 part by weight, it does not contribute to the improvement of high temperature resistance. On the other hand, if it exceeds 100 parts by weight, the physical properties of the cured product are adversely affected and the physical properties required as a coating substrate cannot be obtained. The more preferable blending amount of the component (D) is 0.5 to 20 parts by weight.

The component (E) platinum or platinum compound used in the present invention may be a known one usually used in hydrosilation reaction, such as platinum black, chloroplatinic acid,
Examples thereof include alcohol modified products of chloroplatinic acid, complexes of platinum with olefins or aldehydes, and complexes of platinum with vinyl siloxane. The amount of the component (E) used is a catalytic amount and may be appropriately adjusted according to the desired curing rate, but the amount of platinum atom relative to the total amount of the components (A), (B) and (C) is In an amount of 0.5 to 200 ppm, preferably 1
Is in the range of up to 100 ppm. If it is less than 0.5 ppm, curing failure is likely to occur, and curing requires high temperature and long time. If it exceeds 200 ppm, not only is it difficult to control the curing reaction, but it is also disadvantageous in terms of cost.

The coating agent of the present invention further comprises (F)
Benzotriazole and / or benzimidazole can be added as a component. The benzotriazole and benzimidazole further improve the high temperature resistance of the present coating substrate. The addition amount of this component is 1 part by weight or less, preferably 0.01 to 1 part by weight, particularly 0.05 to 0.5 part by weight, relative to 100 parts by weight of the component (A). This compound can improve the high temperature resistance even if added in a small amount, but if it is added in an amount exceeding 1 part by weight, the curability of the coating composition will be slow and the workability will be poor. The purpose can be achieved without adding this substance, but the addition can further improve the high temperature resistance.

The coating agent of the present invention also comprises
It is recommended to add a reinforcing silica as the component (G). The reinforcing silica as the component (G) is a component for reinforcing the mechanical strength of the cured product, and may be a known one conventionally used for silicone rubbers. Examples thereof include fumed silica, precipitated silica, and calcined silica. , Quartz powder, diatomaceous earth, etc., and these may be used alone or in combination of two or more kinds. These silica particles usually have a specific surface area of 50 by the BET method.
m ² / g or more, in particular of about 50 to 500 m ² / g are common. Such reinforcing silica may be used as it is, but its surface is treated with an organosilicon compound such as methylchlorosilanes, dimethylpolysiloxane and hexamethyldisilazane in order to impart good fluidity to the coating agent. It is preferable to use the above. The amount of component (G) used is 100 parts by weight or less, preferably 5 to 100 parts by weight, and more preferably 10 to 70 parts by weight per 100 parts by weight of component (A). If it is less than 5 parts by weight, the reinforcing effect may be poor, and if it exceeds 100 parts by weight, the fluidity of the composition is lowered and the workability is deteriorated.

The coating agent of the present invention contains
In addition to the components, if necessary, adhesion promoters, reaction control agents, etc.
You may mix | blend. Also other types of organopolysiro
Xanthan may be further added. In this way,
As an additive which may be combined, for example, two or more
Is 3 alkoxy groups and at least 1 alkenyl
Group, acryloxy group, methacryloxy group, glycidoxy
Organosilane compound having a functional group such as a group (silane
Coupling agent), specifically vinyltrimethoxysila
3-methacryloxypropyltrimethoxysilane,
3-acryloxypropyltrimethoxysilane, 3-g
Adhesion promotion such as lysidoxypropyltrimethoxysilane
Agent, methyl vinyl cyclopolysiloxane, acetylene
Reaction system for rucoles and triallyl isocyanurate
A plasticizer such as a non-functional dimethyl polysiloxane.
And viscosity modifiers, etc., and increase the viscosity of coating agents
As a compound that improves mechanical strength without
SiO₂And R ₃SiO_1/2Unit, if necessary R₂
SiO_2/2Unit, RSiO_3/2Unit (R is R²One similar to
A valent hydrocarbon group) and at least one
Silicone soluble in silicone oil containing alkenyl groups
Corn resin can also be used. Use of these additives
The dose is arbitrary as long as the effects of the present invention are not impaired.

The coating agent of the present invention comprises all the above components,
Especially in the state where (A), (B) and (E) are mixed,
The reaction of the component (A) and the component (B) by the component (E) proceeds to start curing. Therefore, effective reaction control agents such as triallyl isocyanurate, acetylene alcohols, etc. are added, or the whole is divided into two groups, that is, divided into a main agent and a curing agent and stored, and all the components are made uniform at the time of use. Mixing is recommended. There is no particular limitation on the combination for dividing into two groups except that (A), (B) and (E) do not coexist in the same group, but for example, a method of dividing into (A) to (D) and (E) ,
In this method, a part of (A), (D) and (E) are used as main components, and (B) and (C) are used as curing agents.

This silicone coating agent can be used without solvent, in an aqueous emulsion system, or in a state diluted with a toluene organic solvent at 25 ° C.
At 1 to 50,000 centipoise, preferably 10
Adjusted to 30,000 centipoise, polyamide fibers, polyester fibers, woven and non-woven fabrics of these fibers,
A base material selected from a thermoplastic elastomer sheet and a polyurethane sheet is coated to form a coating film having a thickness of about 5 to 20 μm. In this case, as a coating method, coating, impregnation, spraying or the like can be adopted, but the viscosity of the coating agent is 50,000.
If it is higher than centipoise, it cannot be uniformly applied to a thickness of 5 to 20 μm.

After coating, usually 60 to 18
It can be cured by heating at 0 ° C. for 0.1 to 10 minutes.

Polyamide fibers, polyester fibers, woven or non-woven fabrics thereof, thermoplastic elastomers or polyurethane sheets, which are the object of the present invention, are wholly or partly coated with the above coating agent having a thickness of 5 to 20 μm. Although a silicone-coated base material having a multi-layered structure is obtained in this manner, the peculiarity of the present invention is that the silicone coating agent and various base materials, a polyamide-based fiber, a polyester-based fiber, and a fiber base material composed of a woven or non-woven fabric of these. It is due to the combination of.

That is, the above silicone coating agent is
The coating film itself having a thickness of 5 to 20 μm may easily burn, but it is possible to unexpectedly reduce the flame propagation speed and the length by compounding this with the above-mentioned base material, particularly the fiber base material. Therefore, it is possible to obtain a processed substrate that can be sufficiently put to practical use even if the thickness is about half or less of the conventional film thickness. Therefore, the silicone-coated base material of the present invention is preferably used as an airbag base material by forming a film of the silicone coating agent on the fiber base material. When the above fiber base material is used for an airbag, the silicone coating film may be formed on the entire surface of the fiber base material, or may be formed only on the portion where the explosion residue from the inflator comes into contact.

[0036]

The silicone-coated base material of the present invention has a silicone coating film of 5 to 20.
Even if it is less than about half of the conventional one, it has excellent combustion resistance,
It is practically used.

[0037]

EXAMPLES The present invention will be specifically described below by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, in the following example, a part shows a weight part. Example 1 54 parts of dimethylpolysiloxane having the following average molecular formula (i) and a viscosity at 25 ° C. of 10,000 cSt blocked with vinyldimethylsilyl groups at both ends, and 16 parts of fine powder silica having a specific surface area of 300 m ² / g by the BET method, Hexamethyldisilazane 3 parts uniformly kneaded and heat treated 7
To 0 part, 30 parts of a vinyldimethylsilyl group-capped dimethylpolysiloxane having a viscosity of 5000 cSt, 2.0 parts of an epoxy group-containing methylhydrogenpolysiloxane represented by the following molecular formula (ii), and a viscosity of 12 cSt at 25 ° C.
2.0 parts of methyl hydrogen polysiloxane represented by the following molecular formula (iii), 10 parts of acetylene black having an average particle size of 0.03 μm, platinum / vinyl siloxane complex / platinum dimethylpolysiloxane solution with both vinyl terminals blocked as a platinum catalyst (Platinum atomic weight 1% by weight) is mixed with 0.2 parts,
A mixture having a viscosity of 280 poise at 25 ° C. was obtained.

A 210 denier nylon 66 cloth was coated with this mixture as a fiber base material. As a coating method, a knife coater was used so that the distance between the blade of the coater and the nylon surface was 20 μm, and after coating, vulcanization was performed at 150 ° C./1 minute. The obtained coated product was uniformly coated, and the thickness of the silicone film was 18 μm.

[0039]

[Chemical 3]

Comparative Example 1 54 parts of a vinyldimethylsilyl group-capped dimethylpolysiloxane blocked at both ends with a viscosity of 10000 cSt at 25 ° C., represented by the above average molecular formula (i), and a fine powder silica having a specific surface area of 300 m ² / g by the BET method. 16 parts and 3 parts of hexamethyldisilazane were uniformly kneaded and heat-treated 7
To 0 parts, 30 parts of dimethylpolysiloxane capped at both ends with vinyldimethylsilyl group having a viscosity of 5000 cSt at 25 ° C.,
2.0 parts of an epoxy group-containing methylhydrogenpolysiloxane represented by the above molecular formula (ii), 2.0 parts of methylnohydrogenpolysiloxane represented by the above average molecular formula (iii), and a platinum / vinylsiloxane complex as a platinum catalyst. / 0.2 parts of a dimethylpolysiloxane solution capped with vinyl groups at both ends (1 wt% of platinum atom weight) was mixed to obtain a mixture having a viscosity of 280 poise at 25 ° C.

A 210 denier nylon 66 cloth was coated with this mixture as a fiber base material. As a coating method, a knife coater was used so that the distance between the blade of the coater and the nylon surface was 50 μm, and after coating, vulcanization was performed at 150 ° C./1 minute. The obtained coating is uniformly coated, and the thickness of the silicone film is equivalent to the thickness of conventional air bags. 4
It was 5 μm.

COMPARATIVE EXAMPLE 2 The same composition as in Comparative Example 1 was used to coat 210 denier nylon 66 cloth. As a coating method, a knife coater is used, and the gap between the blade of the coater and the nylon surface is 20 μm. After coating,
It was vulcanized at 150 ° C./1 minute. The obtained coated product was uniformly coated, and the thickness of the silicone film was 18 μm.

Example 2 80 parts of dimethylpolysiloxane blocked with vinyldimethylsilyl groups at both ends and having a viscosity of 100,000 cSt at 25 ° C., represented by the above average molecular formula (i), fine powder silica having a specific surface area of 300 m ² / g by the BET method. 20 parts and 3 parts of hexamethyldisilazane were uniformly kneaded and heat-treated to 100 parts, and 2.0 parts of methylhydrogenpolysiloxane containing a trimethoxysilyl group and an epoxy group represented by the following molecular formula (iv): 2.0 parts of methyl hydrogen polysiloxane represented by the above average molecular formula (iii),
5 parts by weight of Fe ₂ O ₃ having an average particle size of 0.16 μm, 0.2 parts by weight of benzimidazole, and a platinum catalyst / platinum siloxane complex / a dimethylpolysiloxane solution containing both vinyl groups at both ends blocked (platinum atomic weight 1% by weight) were used. To a mixture obtained by mixing 2 parts, 120 parts of toluene was added and uniformly dissolved to obtain a mixture having a viscosity of 80 poise at 25 ° C.

A 210 denier nylon 66 cloth was spray-coated with this mixture as a fiber base material, and after the solvent was volatilized at 80 ° C. for 5 minutes, it was heated and cured at 150 ° C. for 1 minute. The obtained coating material was uniform, and the thickness of the silicone coating was 5 μm.

[0045]

[Chemical 4]

Example 3 A 210 denier nylon 66 cloth was impregnated with the mixture shown in Example 2. The obtained impregnated product is heated at 80 ° C / 5
After volatilization of the solvent, it was heated and cured at 150 ° C. for 1 minute. The obtained impregnated product is uniform, and the thickness of the silicone film is 10μ.
It was m.

Example 4 A mixture having a viscosity of 80 poise at 25 ° C. was obtained in the same manner as in Example 2 except that benzimidazole was not added.

A 210 denier nylon 66 cloth was spray-coated with this mixture as a fiber base material, and after the solvent was volatilized at 80 ° C. for 5 minutes, it was cured by heating at 150 ° C. for 1 minute. The obtained coating material was uniform, and the thickness of the silicone coating was 5 μm.

Next, with respect to the silicone film-coated substrate of the above example, the US automobile safety standard "FVMS-30" was used.
A combustion test was conducted based on the "2" method. For comparison, the nylon cloth used in the above example was used for the combustion test as it was without being coated (Comparative Example 3). The results are shown in Table 1.

[0050]

[Table 1]

Here, the burning velocity is an amount defined by the following equation. Combustion rate = 60 × flame propagation length / flame propagation time As can be seen from the results in Table 1, Comparative Example 3 was an uncoated cloth, so it burned to melt and partly dropped. Since Comparative Example 2 is a coated cloth, unlike the Comparative Example 3, the melt did not drop, resulting in long-term combustion. Example 1
No. 4 obtained the same level of flammability as Comparative Example 1 with the conventional coat thickness.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area C09D 183/07 PMU D03D 1/02

Claims (4)

[Claims] 1. A base material selected from polyamide-based fibers, polyester-based fibers, woven and non-woven fabrics thereof, thermoplastic elastomers and polyurethane sheets, and (A) directly bonded to a silicon atom in one molecule. 100 parts by weight of organopolysiloxane having at least two alkenyl groups (B) A sufficient amount to give 0.5 to 4 hydrogen atoms bonded to silicon atoms to one alkenyl group in component (A). Organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule (C) Via at least one hydrogen atom bonded to silicon atoms in one molecule and a carbon atom directly bonded to silicon atoms Organosilicon compound having at least one epoxy group and / or trialkoxysilyl group bonded to a silicon atom by 0.1 to 1
0 parts by weight (D) carbon, NiO ₂ , FeO, FeO ₂ , Fe
₂ O ₃ , Fe ₃ O ₄ , CoO ₂ , CeO ₂ and TiO ₂ One or more powders having an average particle size of 20 μm or less 0.1 to 100 parts by weight (E) A catalytic amount of platinum or platinum 5-20 coatings of silicone coatings containing compounds
A substrate coated with silicone, which is formed to have a thickness of μm. 2. A silicone coating agent further comprising (F)
1 benzotriazole and / or benzimidazole
The silicone-coated base material according to claim 1, which is compounded in an amount of not more than 1 part by weight. 3. The silicone coating agent further comprises (G)
The silicone-coated substrate according to claim 1 or 2, further comprising 100 parts by weight or less of reinforcing silica. 4. An airbag base material having a film of the silicone coating agent according to claim 1, formed on a fiber base material made of polyamide fiber, polyester fiber, or a woven or non-woven fabric thereof.